Gasoline stocks rose 6.8 million barrels, to 220.9 million barrels, according to the report from the U.S. Energy Information Administration (EIA), much more than analyst expectations in a Reuters poll for a gain of 1.7 million barrels.

“This suggests that refiners may not need to process as much crude in the future,” ANZ said in a note on Thursday.

“The EIA report also showed that U.S. production increased again,” the bank said.

U.S. crude production climbed by 25,000 barrels per day (bpd)to 9.71 million bpd, the highest since monthly figures showing the United States produced more than 10 million bpd in the early 1970s.

Soaring U.S. output threatens to undermine efforts led by the Organization of the Petroleum Exporting Countries (OPEC) and Russia to bring production and demand into balance following years of oversupply.

Sukrit Vijayakar, managing director of energy consultancy Trifecta warned there were “darker shadows over the pace of rebalancing, if at all any is taking place.”